Door-operating mechanism for mixing machines



July 29, 1930.- A. c. CHRISTENSEN DOOR OPERATING MECHANISM FOR MIXING MACHINES Filed Sept. 10, 1928 22 Sheets-Sheet l v A w Ziv/iifiirg IIIIIININIMIW 1 I mi Azwvarz ::7.z-"' fllfred C(lzrzlstensen.

y 3 A. c. CHRISTENSEN 1,771,393

DOOR OPERATING MECHANISM FOR MIXING MACHINES Filed Sept. 10, 1928 2 Sheets-Sheet 2 in var-72:

fllffed C Czrz'si'ensen,

just above the. shoulder 7 Patented July 2i?,1930,

outrun STATES IVP-ATEN ALFRED o. CHRISTENSEN, or CHICAGO, ILLINOIS, .irssxenon 'ro NATIONAL ENGINEER- ING COMPANY, or CHICAGO, rumors, A 'oonronATIoN or rumors I DOOR-QPERATING MECHANISM ron iIIxme'MAoHinEs j p Application filed September 10, 1928. Serial No; 304599 1.

This invention'relates to door operating mechanism for mixing machines, and con-' cerns itself with means for simultaneously operating a pair of doors by fluid pressure 5 and maintaining the same in' closed position. The invention comprises a novel structure and combination of parts hereinafter described and more particularly pointed out and defined in the appended claims. lo I In the accompanyingdrawings which illustrate a preferred embodiment of this invention and in which similar reference numerals refer'to similar features in the different views-. 7 Figure 1 is a front elevational View of a mixing machine showing merely the mixing receptacle involving this invention Figure 2 is a view similar to Figure l with parts broken away.

Figure 3*is a side elevational View of the mixingreceptacle, v V

Figure 4 is afragmentary plan view taken on the line IV-IV of Figure 1 and looking upward in the direction of the arrows.

7 In the drawing there is shown a mixing receptacle l 'which is supported on suitable pedestals 2. I The bottom of the receptacle is provided with a pair of discharge opening I 3 which are'adapted to beclos ed discharge 3 doors 4;. Adjacent the inner margin of each door opening 3 there is arod 5 which is suitably journaled to the bottom of the receptacle and each'door 4 has suitable castings o1 brackets 6 which are rigidly secured .to the I '35 rods 5 whereby the rotation of the rods 5 in' I the proper directions'will' cause the doors to be swung to their open or closed position.

I It will be noted from an inspection of Figures 3 and 4 that the rods 5. extend beyond the periphery of the receptacle land that arms 7 are rigidly'secured upon the extended ends of the rods 5. The lower ends of the arms 7 are provided with shoulders 7?. link 8 is pivotally conncctedfto each arm 7 twill be noted that each link '8 has a bifurcated end-which straddles itsarm -7 and the shoulders 7 which constitute stop members, extend beyond the bifurcations as shown in Figure 4 and thus limit the downward movement of i tend to maintain said links; The inner ends of the links 8 are pivotally connected to a bolt 9. 'Thelower bifurcated end of a piston rod 10 is conneeted to the outer endsof the bolt 9 and confines the links 8 within the bifurcation thereof. The upperend of the piston rod 10 extends into a fluid pressure cylinder ll which-is supported upon a suitableb'racket attached toth'e receptacle. Afluid supply pipe 13 provided with athree way valve 14: and a pair of branches 15 and 16which respectively extend into the pressure cy'linderll above and below the piston is providedfor supplying the necessary fluid pressure to the cylinder.

into'the dotted line position shown in Fig I ure 2. The shoulders or stop members 7 engaging the links 8 as shown in dotted lines 1n Figure 2 thus limitingthe upward pull'on the opening movements of the doors.

VVhenit is desired to close the doors the operatorwill, of course, manipulate the three way cock so that fluid pressurewill enter above the piston and force the piston'rod downwardly into the position shown in full lines for swinging the doors to their closed position. In this'positionthe links are in alignment and hence upon dead center with the result thatthe doors will be held in their closed position. Further, if the fluid pressure is allowed to act upon the upper side of thevpiston the pressure thereofwill also 7 the doors intheir closed position. j t I t.

From the foregoing it will be evident that i the piston rod and at the same time limiting V avery simple door operating mechanism has 1 been provided whereby the doors may be quickly opened and closed without any physical efi'ort, and whereby a great dealof time made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention: 1. In a mixing machine embodying a receptacle having a pair of discharge openings, a pair of doors for closing said open- 7 10 ings, a rotatable rod for supporting each door, an arm upon each rod,a link pivotally connected to each arm, a pivot pin connecting said links, an operating member connected to said pin, and means'for maintaining said links upon dead center alignment for'inain taining said doors in closed position, the said I means comprising shoulders on the said arms positioned adjacent the ends to which the said links are pivoted to abut the said links and thereby limit their movement, 7 1 V 2. In a mixingmachine embodying a receptacle having a pair of discharge openings, a rod journaled adjacent each of said open.- .ings, a door rigidly securedto said rod, an arm rigidly secured to'said rod, a fluid pressure cylinder, :1 piston havinga rod operating in said cylinder, control means for, said fluid pressure, and links pivotally 7 connecting said arms to said rod, each associated arm 39 andlink having co-active terminal shoulders for engagement to maintain said links upon dead center alignment for maintaining said doors in closed position. 1

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County,

Illinois. 7

ALFREDO. CHRISTENSEN. 

